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Quick writing: a one-liner lambda function
a = lambda t: a_0 if t < tp else k*a_0
In general,
f = lambda arg1, arg2, ...: expressin
is equivalent to
def f(arg1, arg2, ...):
return expression
One can use lambda functions directly in calls:
u, t = solver(1, lambda t: 1, lambda t: 1, T, dt, theta)
for a problem \( u'=-u+1 \), \( u(0)=1 \).
A lambda function can appear anywhere where a variable can appear.
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